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cxl/hdm: Use guard() in cxl_dpa_set_mode()

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Additional DCD functionality is being added to this call which will be
simplified by the use of guard() with the cxl_dpa_rwsem.

Convert the function to use guard() prior to adding DCD functionality.

Suggested-by: Jonathan Cameron <Jonathan.Cameron@Huawei.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Link: https://patch.msgid.link/20241107-dcd-type2-upstream-v7-5-56a84e66bc36@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
This commit is contained in:
Ira Weiny 2024-11-07 14:58:23 -06:00 committed by Dave Jiang
parent 0f6f0d687a
commit 27fcfb4168
1 changed files with 6 additions and 15 deletions
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21
drivers/cxl/core/hdm.c
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@ -424,7 +424,6 @@ int cxl_dpa_set_mode(struct cxl_endpoint_decoder *cxled,
struct cxl_memdev *cxlmd = cxled_to_memdev(cxled);
struct cxl_dev_state *cxlds = cxlmd->cxlds;
struct device *dev = &cxled->cxld.dev;
int rc;
switch (mode) {
case CXL_DECODER_RAM:
@ -435,11 +434,9 @@ int cxl_dpa_set_mode(struct cxl_endpoint_decoder *cxled,
return -EINVAL;
}
down_write(&cxl_dpa_rwsem);
if (cxled->cxld.flags & CXL_DECODER_F_ENABLE) {
rc = -EBUSY;
goto out;
}
guard(rwsem_write)(&cxl_dpa_rwsem);
if (cxled->cxld.flags & CXL_DECODER_F_ENABLE)
return -EBUSY;
/*
* Only allow modes that are supported by the current partition
@ -447,21 +444,15 @@ int cxl_dpa_set_mode(struct cxl_endpoint_decoder *cxled,
*/
if (mode == CXL_DECODER_PMEM && !resource_size(&cxlds->pmem_res)) {
dev_dbg(dev, "no available pmem capacity\n");
rc = -ENXIO;
goto out;
return -ENXIO;
}
if (mode == CXL_DECODER_RAM && !resource_size(&cxlds->ram_res)) {
dev_dbg(dev, "no available ram capacity\n");
rc = -ENXIO;
goto out;
return -ENXIO;
}
cxled->mode = mode;
rc = 0;
out:
up_write(&cxl_dpa_rwsem);
return rc;
return 0;
}
int cxl_dpa_alloc(struct cxl_endpoint_decoder *cxled, unsigned long long size)